pharynx vs yap

pharynx

noun
  • The part of the alimentary canal and respiratory tract that extends from the back of the mouth and nasal cavity to the larynx and esophagus. 

  • The part of the alimentary canal immediately behind the mouth in invertebrates that may be thickened and muscular, eversible and toothed, or adapted as a suctorial organ. 

yap

noun
  • The mouth, which produces speech. 

  • The high-pitched bark of a small dog, or similar. 

  • Casual talk; chatter. 

  • A badly behaved child; a brat. 

verb
  • Of a small dog, to bark. 

  • To talk, especially excessively; to chatter. 

  • To rob or steal from (someone). 

How often have the words pharynx and yap occurred in a corpus of books? (source: Google Ngram Viewer )